CN113600770B - System and method for reducing waste amount of steel billets during continuous casting and replacing of water outlet - Google Patents
System and method for reducing waste amount of steel billets during continuous casting and replacing of water outlet Download PDFInfo
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- CN113600770B CN113600770B CN202110798238.3A CN202110798238A CN113600770B CN 113600770 B CN113600770 B CN 113600770B CN 202110798238 A CN202110798238 A CN 202110798238A CN 113600770 B CN113600770 B CN 113600770B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/163—Controlling or regulating processes or operations for cutting cast stock
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a system for reducing waste amount of steel billets during continuous casting and replacing a water outlet, relates to the technical field of metal continuous casting, and solves the technical problem that excessive waste amount of steel billet interfaces is cut due to replacement of the water outlet in the related technology. The system comprises a thermal detection mechanism, the steel billet passes through a cutting device and the thermal detection mechanism in sequence along a steel billet outlet of the crystallizer, the thermal detection mechanism is used for sending a signal of starting to replace a water outlet when detecting a cutting end part, and the steel billet continuous casting production has a preset steel billet fixed length L 1 The roller way can transport the shortest steel billet length S and the preset minimum cutting amount y, and the steel billet length between the steel billet outlet and the thermal detection mechanism is L 2 ，L 2 ＝n*L 1 + x, n is a positive integer, 0 ≦ x < (S-2 y). The waste cutting amount of the waste steel generated by the replacement of the lower nozzle processed by the system is x +2y, and x +2y is more than or equal to 2y and less than S, so that the waste billet cutting amount is reduced, the economic value is achieved, the structure is simple, the cost is low, the application is simple, and the position of a billet connector does not need to be manually tracked.
Description
Technical Field
The invention relates to the technical field of metal continuous casting, in particular to a system and a method for reducing the waste amount of steel billets during continuous casting and replacing a water outlet.
Background
With the rapid development of the steel industry, the demand of variety steel is increasing. Most of the variety steels have strict control on harmful elements such as phosphorus, sulfur, oxygen, nitrogen and the like, and generally deoxidation and refining treatment are carried out to achieve the purpose of reducing the harmful elements. The deoxidation generally adopts aluminum to carry out deep strong deoxidation, and the LF furnace refining is subsequently adopted, and a deoxidation product Al2O3 exists in the molten steel in the form of solid inclusions, can not be completely removed, adheres to the inner wall of a lower nozzle in the continuous casting process, gradually causes the inner diameter of the lower nozzle to be reduced, and at the moment, the lower nozzle must be replaced.
Molten steel is required to be cut off when a water outlet is replaced every time, the casting speed of the continuous casting machine is reduced, the time for replacing the water outlet is different from 30 seconds to 100 seconds, the temperature difference exists between the newly poured molten steel and the original molten steel, and an obvious boundary exists, namely a steel billet interface. Casting defects exist at and near the interface of the billet, which can cause product quality defects in the rolling process, and the cutting must be carried out, and the minimum cutting amount is generally 200mm respectively before and after the interface.
The general practice adopted by steel mills is as follows: after the lower nozzle is replaced in continuous casting, the bench worker contacts a continuous casting billet cutting worker under the bench to find the position of the interface, and the cutting is carried out according to the length condition of the residual steel billet before the interface. The cutting of the steel billet is provided with the fixed length of the steel billet, the fixed length of the steel billet is limited by the length (such as 3 m) of the shortest steel billet which can be transported by a roller way, the steel billet which can be transported by the shortest steel billet length by the roller way is cut at least before and after the steel billet interface is cut off and is used as scrap steel, and the disadvantage that the cutting waste amount of the steel billet interface is too much exists.
Disclosure of Invention
The application provides a system for reducing billet waste volume when changing down the mouth of a river in continuous casting, has solved because change down the mouth of a river and have the too much technical problem of billet interface cutting waste volume among the correlation technique.
The application provides a system for reducing steel billet waste amount when mouth of a river under continuous casting change, the crystallizer is worn to locate by the mouth of a river down, the crystallizer is equipped with the steel billet export, the system disposes cutting equipment, cutting equipment is used for cutting the steel billet and forms the cutting tip in the steel billet, the system includes hot detection mechanism, the steel billet passes through cutting equipment and hot detection mechanism along the steel billet export in proper order, hot detection mechanism usesWhen the cutting end part is detected, a signal for starting to replace the water outlet is sent, and the specified length L of the preset billet exists in the continuous casting production of the billet 1 The shortest steel billet length S and the preset minimum cutting amount y can be transported by the roller way, and the steel billet length between the steel billet outlet and the thermal detection mechanism is L 2 ，L 2 =n*L 1 + x, n is a positive integer, x is a non-negative number, 0 ≦ x < (S-2 y).
Alternatively, x =0, L 2 =n*L 1 。
Optionally, the system is provided with a preset minimum cut amount, one end of the billet far away from the billet outlet is a first end when the lower nozzle is replaced, the billet outlet continues to output in the replacement process of the lower nozzle, and the length of the billet between the first end and the billet outlet after the replacement of the lower nozzle is finished is (n × L) 1 +y）。
Optionally, the system is further provided with a control panel, the control panel comprises a preparation unit, a prompt unit and a completion unit, the preparation unit is used for outputting a replacement preparation signal when the nozzle needs to be replaced by the continuous casting platform operator, the prompt unit is used for sending a replaceable signal when the thermal detection mechanism detects the cutting end part, and the completion unit is used for sending a replacement completion signal when the nozzle needs to be replaced by the continuous casting platform operator.
Optionally, y is chosen to be 200 mm.
Optionally, the thermal detection mechanism comprises a hot metal detector.
Optionally, the prompting unit comprises an audible and visual alarm.
Optionally, the system is further provided with a master control room, the master control room is in signal connection with the control panel, and the master control room is used for controlling the cutting equipment.
Optionally, the steel billet comprises a grade steel.
The method for reducing the waste amount of the steel billets during the continuous casting replacement of the water outlet is applied to the system for reducing the waste amount of the steel billets during the continuous casting replacement of the water outlet, and further comprises the step of controlling cutting equipment, wherein after a signal for starting the replacement of the water outlet is sent by a thermal detection mechanism, a steel billet outlet is continuously output in the replacement process of the water outlet, and the steel billets between the thermal detection mechanism and a crystallizer are firstly output according to the preset steel billet fixed length L 1 Cutting (n-1) segments in sequenceThen according to length (L) 1 + x) cutting, and then cutting according to the preset billet fixed length L 1 Continuing cutting;
will length (L) 1 + x) is cut from the billet section x lengths of scrap are removed.
The beneficial effect of this application is as follows: the application provides a system that is used for reducing steel billet waste amount when mouth of a river under continuous casting change, when the mouth of a river under needs crystallizer department is changed, when sending the signal that begins to change mouth of a river under the heat detection mechanism, the mouth of a river under the last operation begins to change of continuous casting platform, steel billet export that corresponds ground crystallizer continues the output, produces the steel billet interface later on, the length of waiting the steel billet of cutting at this in-process is L 2 +2y, i.e. n x L 1 + x +2y, firstly, the billet to be cut is sized according to the preset billet length L 1 Cutting n-1 times to obtain a fixed length L 1 The remaining L is added to the good billet 1 The + x +2y is cut, the steel billet after the interface of the steel billet is processed is normally cut, so that the system is used for processing the waste steel generated by replacing the lower nozzle, and the abnormal steel only has the length L 1 + x +2y segment, so that the segment can be formed into a length L meeting the preset billet fixed length by cutting off redundant x +2y 1 The quality steel billet is good, x is more than or equal to 0 and less than (S-2y), so that x +2y is more than or equal to 2y and less than S, the waste cutting amount actually formed by the system meets the requirement of a preset minimum cutting amount y before and after a steel billet interface, and is less than the shortest steel billet length S which can be transported by a roller way, so that compared with the situation that the steel billet which can transport the shortest steel billet length by the roller way needs to be cut off as waste steel in the related technology, the system provided by the application reduces the waste cutting amount, has good economic value especially for the steel billet with high value, has simple structure, low cost and simple application, realizes automatic positioning cutting of the steel billet interface position through a thermal detection mechanism, does not need manual tracking, is simple to operate, and has popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
Fig. 1 is various schematic diagrams illustrating a steel billet interface cut by replacing a water discharge port in the related art;
FIG. 2 is a schematic structural diagram of a system for reducing steel billet scrap amount in continuous casting replacement of a nozzle provided by the present application;
FIG. 3 is a schematic view of the control panel of FIG. 2;
fig. 4 is a schematic diagram of the operation of the hot metal detector provided in the present application.
The attached drawings are marked as follows: 100-a water outlet, 200-a crystallizer, 210-a steel billet outlet, 220-molten steel, 300-a steel billet, 400-a cutting device, 500-a heat detection mechanism, 600-a control panel, 610-a preparation unit, 620-a prompt unit, 630-a completion unit, 21-a steel billet interface, 22-a steel billet before interface, 23-a steel billet after interface and 24-a waste billet.
Detailed Description
The embodiment of the application solves the technical problem that excessive waste cutting amount of a steel billet interface exists due to the replacement of the lower nozzle in the related technology by providing the system for reducing the waste amount of the steel billet during the replacement of the lower nozzle in the continuous casting.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the utility model provides a system for be used for continuous casting to change when mouth of a river reduce steel billet waste volume, the crystallizer is worn to locate by the mouth of a river down, the crystallizer is equipped with the steel billet export, the system configuration has cutting equipment, cutting equipment is used for cutting the steel billet and forms the cutting tip in the steel billet, the system includes hot detection mechanism, the steel billet passes through cutting equipment and hot detection mechanism along the steel billet export in proper order, send the signal that begins to change the mouth of a river down when hot detection mechanism is used for detecting the cutting tip, there is steel billet scale length L of predetermineeing in steel billet continuous casting production 1 The shortest steel billet length S and the preset minimum cutting amount y can be transported by the roller way, and the steel billet length between the steel billet outlet and the thermal detection mechanism is L 2 ，L 2 =n*L 1 + x, n is a positive integer, x is a non-negative number, 0 ≦ x < (S-2 y).
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1
In order to solve the technical problem that the scrap cutting amount of the steel billet interface 21 is excessive due to the replacement of the drain 100 in the prior art, the application provides a system for reducing the scrap amount of the steel billet 300 when the drain 100 is replaced in continuous casting.
First, please refer to fig. 1 for describing in detail various situations of cutting the billet holder 21 by replacing the drain 100 in the related art.
The billet 300 continuous casting production has the preset billet fixed length L 1 The steel blank 300 output from the crystallizer 200 is normally cut into L 1 A long length of billet 300. Due to the reduced inner diameter of the nozzle 100, which requires replacement, a billet joint 21 is formed, casting defects exist at and near the billet joint 21, which must be cut and controlled with a minimum cut-off, which is 200mm for example in the detailed description herein. And the length of the shortest steel billet 300 which can be charged in the heating furnace in the next working procedure is K, and the general K =0.75L 1 And there is a shortest billet length that the roller table can transport, here exemplified as 3 m.
In which fig. 1 shows a billet interface 21, a pre-interface billet 22 portion before the billet interface 21, a post-interface billet 23 portion after the billet interface 21, and in each case a scrap billet 24 (i.e. the dashed box portion in fig. 1) formed.
Specifically, referring to the uppermost diagram of fig. 1, when the length of the billet 22 before the interface before the billet interface 21 is greater than (0.75L) 1 +200 mm), cutting is carried out at the position 200mm in front of the steel billet interface 21, and cutting is carried out at the position 2.8m behind the steel billet interface 21, namely, the length of about 3m needs to be cut off, namely, the shortest steel billet length which can be transported by a roller way needs to be met, otherwise, the waste billet 24 is too short and cannot be transported to a continuous casting billet turnover cooling bed on the roller way, and the subsequent production is influenced;
referring to the middle part of FIG. 1, the billet 22 before the billet interface 21 is shown as long as it is before the interfaceDegree less than (0.75L) 1 +200 mm) is greater than 2.8m, it is not cut before the billet joint 21 and is cut 200mm after the billet joint 21, that is, it is cut off (0.75L) 1 +400 mm) long blanks 24. Assuming the billet length L 1 The cutting length is 12m, 9.4m needs to be cut off, because if the cutting is carried out according to the shortest cutting length, the length of the billet 300 before the interface is too short to be suitable for entering a next-process heating furnace for production;
referring to the lowest diagram of fig. 1, when the length of the billet 22 before the billet interface 21 is less than 2.8m and greater than 200mm, the billet must be cut from the billet interface 21, and the waste billet 24 with the length of 3m is cut.
Therefore, in the related art, the cutting of the billet holder 21 is performed in connection with the replacement of the drain 100, and the cutting amount is as small as 3m at the minimum and (0.75L) at the maximum 1 +400 mm), there is a defect of excessive scrap cutting.
Therefore, referring to fig. 2, the inventor has invented a system for reducing the waste amount of a steel billet 300 when the steel billet 300 is continuously cast and replaced by the water outlet 100, the water outlet 100 is inserted into the mold 200, the mold 200 is provided with a steel billet outlet 210, the mold 200 is internally provided with molten steel 220, the system is provided with a cutting device 400, the cutting device 400 is used for cutting the steel billet 300 and forming a cut end on the steel billet 300, the system comprises a thermal detection mechanism 500, the steel billet 300 sequentially passes through the cutting device 400 and the thermal detection mechanism 500 along the steel billet outlet 210, the thermal detection mechanism 500 is used for sending a signal for starting to replace the water outlet 100 when detecting the cut end, and a preset steel billet fixed length L exists in the continuous casting production of the steel billet 300 1 The shortest steel billet length S and the preset minimum cutting amount y which can be transported by the roller way, and the length of the steel billet 300 between the steel billet outlet 210 and the thermal detection mechanism 500 is L 2 ，L 2 =n*L 1 + x, where n is a positive integer, x is a non-negative number, 0 ≦ x < (S-2 y).
In the present system, the nozzle 100 at the crystallizer 200 needs to be replaced, and when the thermal detection mechanism 500 signals the start of the replacement of the nozzle 100, the operator on the continuous casting platform starts the replacement of the nozzle 100. Correspondingly, the billet outlet 210 of the mold 200 continues to discharge and later produces the billet connection 21, after which the billet continues to be dischargedThe length of the billet 300 to be cut in the process is L 2 +2y, i.e. n x L 1 +x+2y。
The part n x L 1 The + x +2y billet 300 to be cut is firstly sized according to the preset billet 1 Cutting the blank to form a fixed length L 1 The remaining L of the good billet 300 1 And + x +2y, and normally cutting the billet 300 after the billet interface 21 is processed. Therefore, the system can process the scrap steel generated by replacing the drain 100, and only the length L is abnormal temporarily 1 A + x +2y segment, and the segment can also form a segment satisfying the preset billet fixed length L by subsequently cutting off redundant x +2y 1 The quality steel billet 300.
And because 0 is more than or equal to x and less than (S-2y), so 2y is more than or equal to x +2y and less than S, the cutting waste amount actually formed by the system not only meets the requirement of a preset minimum cutting amount y before and after the billet interface 21, but also is less than the shortest billet length S which can be transported by a roller way. Therefore, compared with the situation that the steel billet 300 with the shortest steel billet length capable of being transported by a roller way needs to be cut off as the scrap steel at least in the related art, the system provided by the application reduces the scrap cutting amount, has good economic value especially for the steel billet 300 with high value, and has the advantages of simple structure, low cost and simple application.
In addition, the system also realizes the automatic positioning cutting of the position of the steel billet interface 21 through the thermal detection mechanism 500, does not need to manually track the specific position of the steel billet interface 21 to carry out corresponding cutting, saves the manual tracking process, is simple to operate, is optimized, and has popularization.
It will be understood that when n takes the value 1, L 2 =L 1 + x, length L which only needs to be carried out for one segment 1 + x one cut of the billet 300.
Alternatively, in an ideal state, x =0, L 2 =n*L 1 In the case of a system for reducing the scrap amount of the steel slab 300 in the continuous casting replacement of the nozzle 100, the resulting scrap length x +2y =0+2y =2y satisfies the requirement of a preset minimum cut-off amount y before and after the slab joint 21, and the cut-off steel slab in this mannerThe length of the waste billet 24 is the minimum, which is a preferred alternative technical scheme.
Optionally, the preset minimum ablation amount y in the present system is selected to be 200 mm.
Optionally, the thermal detection mechanism 500 includes a hot metal detector, please refer to fig. 4, and accordingly, the specific principle of the thermal detection mechanism 500 sending a signal to start replacing the drain 100 when detecting the cutting end is: when the hot metal detector detects a red steel state, the red steel state is a high-temperature state of the steel billet 300, the system waits and does not send a signal, and an operator on the platform does not replace the drain 100 temporarily; when the hot metal detector is in a state of not detecting the red steel and then detecting the red steel, the cutting device 400 cuts the billet 300 to form a cut end which just passes through the position of the hot metal detector, and a signal for requesting to replace the drain 100 is sent to the system. And it is noted that a signal to start replacement of the drain 100 is issued when the red state is detected again.
The thermal detection mechanism 500 may be implemented by other temperature detection mechanisms or visual capture mechanisms, in addition to the hot metal detector.
It should be noted that, in order to enable an operator of the continuous casting platform to replace the nozzle 100 in time when a signal for requesting to start replacing the nozzle 100 is sent, the precondition that the thermal detection mechanism 500 sends the signal for starting replacing the nozzle 100 may be set that the operator first sends a signal to the system that the operator is ready to replace the nozzle 100.
Optionally, the system is further provided with a control panel 600, the control panel 600 includes a preparation unit 610, a prompt unit 620 and a completion unit 630, the preparation unit 610 is used for outputting a signal for preparation for replacement when the continuous casting platform operator needs to replace the nozzle 100, the prompt unit 620 is used for sending a replacement signal when the thermal detection mechanism 500 detects the cutting end, and the completion unit 630 is used for sending a signal for completion of replacement when the continuous casting platform operator finishes replacing the nozzle 100.
In the actual production process, when an operator on the continuous casting platform needs to replace the drain 100, the "preparation for replacement" button to which the preparation unit 610 of the control panel 600 belongs is pressed, and at this time, if the thermal detection mechanism 500 detects that the steel is in the red state, the system light band does not give a signal for starting replacement, and the operator does not replace the drain 100 for the moment; if the hot metal detector does not detect the red steel state, and then detects the red steel state again, a signal for starting to replace the drain nozzle 100 is given while the red steel state is detected, and the prompter of the prompting unit 620 of the operation panel reminds an operator of starting to replace the drain nozzle 100. After the operator finishes the replacement, the replacement completion signal is sent through the "replacement completion" button of the completion unit 630 of the operation panel, and the entire replacement process is completed.
Optionally, the prompting unit 620 includes an audible and visual alarm, which can emit audible and visual prompting information to prompt the operator to start replacing the drain 100. The prompting unit 620 may also be composed of a buzzer or the like.
Optionally, the system is further provided with a master control room, the master control room is in signal connection with the control panel 600, and the master control room is used for controlling the cutting device 400. Specifically, in the case where the operator replaces the drain 100, the reference n x L is provided 1 The + x +2y billet 300 to be cut is firstly sized according to the preset billet by controlling the cutting equipment 400 1 Cutting the blank to form a fixed length L 1 The remaining L of the good billet 300 1 Cutting is performed in the + x +2y state, and then cutting is performed in a normal state.
Optionally, the system is provided with a preset minimum cut amount, one end of the billet 300 far away from the billet outlet 210 when the drain 100 is replaced is a first end, the billet outlet 210 continues to output in the replacement process of the drain 100, and the length of the billet 300 between the first end and the billet outlet 210 after the replacement of the drain 100 is completed is (n × L) 1 +y）。
Each replacement of the nozzle 100 requires the interruption of the molten steel 220, the continuous casting speed of the billet 300 during the replacement of the nozzle 100 changes, and the time taken to replace the nozzle 100 also changes, during which the billet 300 advances, i.e. the length of the billet 300 continuously delivered by the billet outlet 210 is the product of the continuous casting speed of the billet 300 during the replacement of the nozzle 100 and the time taken to replace the nozzle 100, generally combined with a predetermined minimum cutThe amount y. When the product value is too large, the length of the billet 300 between the heat detecting mechanism 500 and the cutting device 400 can be adjusted to be (n × L) between the first end and the billet outlet 210 after the lower nozzle 100 is replaced 1 + y) and the actual amount of scrap 24 following it is 2y, enabling further savings in the billet 300.
Alternatively, the billet 300 in the above-described embodiment may be made of steel of other types. Most of the varieties of steel strictly control harmful elements such as phosphorus, sulfur, oxygen, nitrogen and the like, and generally, deoxidation and refining treatment are carried out to achieve the purpose of reducing the harmful elements.
Example 2
A method for reducing the amount of the waste of the steel billet 300 during the replacement of the drain 100 in the continuous casting is applied to the system for reducing the amount of the waste of the steel billet 300 during the replacement of the drain 100 in embodiment 1, and comprises the steps of controlling the cutting equipment 400, continuously outputting the steel billet outlet 210 in the replacement process of the drain 100 after the thermal detection mechanism 500 sends a signal for starting to replace the drain 100, and firstly outputting the steel billet 300 between the thermal detection mechanism 500 and the crystallizer 200 according to the preset steel billet fixed length L 1 Cutting the (n-1) segments in sequence, followed by the length (L) 1 + x) cutting, and then cutting according to the preset billet length L 1 Continuing cutting; then the length (L) 1 + x) the billet 300 segment cuts the x long scrap billet 24.
Therefore, the method of the embodiment reduces the waste cutting amount caused by cutting the steel billet 300 by replacing the water outlet 100, has economic value, is simple to apply and convenient to implement, does not need to manually track the position of the steel billet interface 21, and is favorable for popularization.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A system for reducing the amount of scrap in billets when replacing a collector nozzle in continuous casting, characterized in that the collector nozzle is inserted into a crystallizer provided with a billet outlet, the system being provided with cutting means for cutting the billets and forming a cut end in the billets;
the system comprises a thermal detection mechanism, wherein a steel billet passes through the cutting equipment and the thermal detection mechanism in sequence along the outlet of the steel billet, and the thermal detection mechanism is used for sending a signal for starting to replace a water outlet when detecting the cutting end part;
the billet continuous casting production has the preset billet fixed length L 1 The roller way can transport the shortest steel billet length S and the preset minimum cutting amount y, and the length of the steel billet between the steel billet outlet and the thermal detection mechanism is L 2 ，L 2 =n*L 1 + x, where n is a positive integer, x is a non-negative number, 0 ≦ x < (S-2 y).
2. The system for reducing the amount of billet scrap in the replacement of a collector nozzle in continuous casting of claim 1, wherein x =0, L 2 =n*L 1 。
3. The system of claim 2, wherein the system provides a predetermined minimum amount of cutting, the end of the billet away from the billet outlet during the replacement is a first end, the billet outlet continues to be output during the replacement, and the length of the billet between the first end and the billet outlet after the replacement is completed is (n x L) 1 +y）。
4. A system for reducing the amount of steel billet waste when changing a nozzle according to any of claims 1-3, characterized in that the system is further provided with a control panel comprising a preparation unit for a continuous casting platform operator to output a preparation change signal when the nozzle needs to be changed, a prompt unit for the thermal detection mechanism to send a change signal when the cutting end is detected, and a completion unit for the continuous casting platform operator to send a change complete signal when the nozzle is completely changed.
5. A system for reducing the amount of steel billet scrap when changing a nozzle according to any of claims 1 to 3, characterized in that y is chosen to be 200 mm.
6. The system for reducing scrap in steel billets as in claim 1 wherein the thermal sensing mechanism includes a hot metal detector.
7. The system for reducing steel billet scrap when changing a nozzle according to claim 4 wherein said prompting unit includes an audible and visual alarm.
8. The system for reducing the amount of steel billet waste in the continuous casting of a nozzle according to claim 4, wherein the system is further provided with a general control room in signal connection with the control panel, the general control room being used for controlling the cutting equipment.
9. The system for reducing scrap in steel billets when replacing a collector nozzle in continuous casting of claim 1, wherein the steel billets include grade steel.
10. Method for reducing the amount of scrap in billets during the replacement of a nozzle in continuous casting, characterized in that it is applied to a system for reducing the amount of scrap in billets during the replacement of a nozzle in continuous casting according to any one of claims 1 to 9, the cutting device being controlled in such a way that the thermal detection means emit a signal to start the replacement of the nozzleAfter the signal is sent, the outlet of the steel billet continues to output in the process of replacing the lower nozzle, and the steel billet between the heat detection mechanism and the crystallizer is firstly subjected to length L according to the preset steel billet fixed length 1 Cutting the (n-1) segments in sequence, followed by the length (L) 1 + x) cutting, and then cutting according to the preset billet length L 1 Continuing cutting;
will length (L) 1 + x) is cut from the billet section x lengths of scrap are removed.
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